San Francisco police said Sunday they had arrested two brothers in the slayings of five people found dead in their home late last week. Binh Thai Luc was arrested on five murder charges and his brother, Brian, was charged with parole violation and possession of drugs and ammunition, police said in a written statement. The pair were charged in the shootings of five members of a family found dead Friday in their home by a relative. Investigators had originally suspected a murder-suicide but later determined the killer was at large. The victims\' names were still being withheld. The motive for the slayings was not discussed, though a source told KGO-TV in San Francisco that the suspects had ties to a gang and may have been in a dispute over gambling debts with one of the victims.